Do you think that the love between sweet, naive little girl and a badass, overpowered devil is possible? Is it even possible to write such a story and make it rational and logical?
Yes and YES!

First of all, this is not your typical xianxia about 3 lives, reincarnations etc... This drama will surprise you a lot. Even if you watched many other xianxias, this one will surprise you with characters' choices, story developments and turnovers.

MAIN LEADS:
The female lead - Orchid - might seem like a cute, naive, sweet little girl that could annoy you through the whole drama, might ruin your fun to watch endlessly, but not hear! If you feel irritated by her character at first, bear with her, just trust her. She will grow on you. Orchid is one of the bravest and most loyal female lead that are out there - she knows who she loves, she can make a decision and do everything for her loved once. Her love won't wave. She knows that decisions she make are risky, but she is brave enough to do them. Her pure intentions and love can melt even the devil's heart and that's what she does.
The romance between the main lead is logical. Our Moon Supreme couldn't fall for Orchid if he weren't bond to her through the Heart Curse. The evil he is, he wouldn't give her a chance to live longer than an hour knowing his short temper.
She is a pure love. He is a pure evil. A true love between Yin and Yang.
And it works.
Both main actors did splendid job with their characters. Their acting was perfect. They know at what stage what they character feels, what are their motivation, and they act just splendid through the whole drama. You can see so much through their expressions and their eyes - it tells the whole story.

Supports:
Characters developments is one of the point that made me truly appreciate this drama. Each, I mean EACH character had their own story, motivation, character and character development. No one stay pure good or pure evil, whatever - all characters change through many circumstainces. They grow, they change. They don't stay stubborn till the day. They know logic. Wow.

Visual development:
The CGI is once of the most beautiful I've ever seen in xianxias. The world building is full of variety. Each scene was built carefully and thought well through - you can see it in the details. Some really good concept artists sat down and spent lot of time wondering how this and that person live, what would they have in their room, in hwta environment they grew up, what are their people customs, what is the lighting, etc. If you watch this drama, you spend a lot of time just consuming these beautiful, well designed environment settings. Mniah :)

Music:
All OSTs are beautiful and addictive :) And they know the right moment to play them ;)

Ahh, whatr to say more? Just go watch the drama, if you haven't seen it yet and don't give up on it after 1 or 2 episodes. It does get better with each one.